When ordinary student Sarah falls for the mysterious Caleb, she must navigate a supernatural high school where secrets are sung and forbidden love carries a dangerous beat.

During their summer break, the human/vampire couple and their friends head to camp, where their love story is complicated by new rivals-including werewolves and gorgons.

As graduation looms, Sarah and Caleb's final year at Crimson High is crashed by an extraterrestrial threat that views monsters and humans alike as obsolete, forcing the ultimate alliance to save their world-and their future.